One vertex per element, one color per generator, with an edge from x to x·s.
(5,6,8,9)(7,11,12,10)(13,14,17,15)(16,19,20,18)(21,22,26,31)(23,28,33,27)(24,29,34,36)(25,30,35,32)(2,4)(6,9)(10,11)(21,23,26,33)(22,27,31,28)(24,32,34,30)(25,29,35,36)(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,15,17,14)(16,19,20,18)(21,23)(22,28)(24,32)(25,29)(26,33)(27,31)(30,34)(35,36)(5,6)(7,11)(8,9)(10,12)(13,16)(14,18)(15,19)(17,20)(21,24)(22,29)(23,32)(25,28)(26,34)(27,35)(30,33)(31,36) involution — undirected(5,7,8,12)(6,10,9,11)(21,25)(22,30)(23,29)(24,27)(26,35)(28,34)(31,32)(33,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.